What Does a VPN Actually Do? Features That Matter and Which VPN Does Them Best

Reading time: 5 minutes

If you’ve ever researched security cameras, a NAS, or remote access, you’ve probably seen the same advice over and over: “Just use a VPN.” It’s good advice — but very few people explain why. Instead, you’re left sorting through technical jargon, marketing buzzwords, and dozens of VPN companies all claiming to be the fastest, safest, or most private.

This guide explains what a VPN actually does in plain English, the features that genuinely matter, and how today’s leading VPN services compare. Whether you’re protecting your home network, securely accessing your security cameras, or simply browsing more privately, you’ll understand what you’re paying for — and which VPN is the best fit for your needs.

If you’re specifically trying to view your security cameras while you’re away from home, our guide on viewing your cameras remotely explains why a VPN is one of the safest ways to do it instead of exposing your devices directly to the internet.

What a VPN Actually Does, in Plain English

Think of a VPN as a secure, encrypted tunnel between your device and the internet. Instead of exposing your traffic to everyone along the way, everything travels through that protected tunnel first.

Example: You’re sitting in an airport checking your home’s security cameras. Without a VPN, your data travels across public Wi-Fi where it could potentially be intercepted. With a VPN enabled, everything between your phone and your home network is encrypted, making it dramatically more difficult for anyone else on that network to see what you’re doing.

A VPN — virtual private network — does two core things. First, it encrypts your internet traffic, wrapping it in a tunnel that nobody between you and the VPN server can read. Your internet provider, the coffee-shop Wi-Fi, anyone snooping on the network — they see scrambled data instead of what you’re actually doing. Second, it hides your real IP address, replacing it with the VPN server’s address, so the websites and services you connect to see the VPN’s location instead of your home.

For a home with security cameras or a NAS, a VPN adds a third practical benefit: it lets you securely connect back to your own home network from anywhere. Instead of poking holes in your firewall to reach your cameras (which exposes them to attackers), you connect through an encrypted tunnel and reach everything as if you were sitting at home. That’s the use case that matters most for anyone building out a connected, monitored home.

The Features That Actually Matter

VPN marketing throws a lot of features at you. Here are the ones that genuinely affect your security and experience, and what each one does.

Kill Switch

A kill switch is non-negotiable. If your VPN connection drops for any reason, the kill switch instantly blocks all internet traffic until the tunnel reconnects. Without it, a dropped connection silently exposes your real IP and unencrypted traffic without you noticing. Every serious VPN includes one — if a service doesn’t, walk away.

Threat Protection (Ad, Tracker, and Malware Blocking)

The better VPNs now do more than tunnel your traffic — they actively block malicious content. This is where the services separate themselves. The strongest implementations block ads and trackers, scan downloaded files for malware, and stop phishing sites before they load, often working even when the VPN tunnel itself is off. This turns a VPN from a privacy tool into a genuine security layer.

Split Tunneling

Split tunneling lets you choose which apps or sites go through the VPN and which connect directly. Useful when you want your browser protected but your work app or a local device to bypass the tunnel for speed or compatibility. A convenience feature, but a genuinely handy one.

Alias Identities and Email Masking

Some VPNs now bundle privacy tools beyond the tunnel, including the ability to generate alias email addresses or even full alias identities (a fake name, email, and number) to use when signing up for services. This keeps your real email out of marketing lists and data breaches. Worth knowing: this is not a universal feature — only certain providers offer it, so if it matters to you, check before you commit.

No-Logs Policy and Jurisdiction

A VPN can see your traffic, so you’re trusting the company not to log it. The credible providers have independently audited no-logs policies, meaning an outside firm verified they don’t keep records of what you do. The country a VPN is based in matters too, because it determines what data-retention laws apply. The leading services are all audited, but they’re headquartered in different privacy jurisdictions.

Server Network and Speed

More servers in more countries means less congestion, more location options, and generally better speed. All major VPNs slow your connection somewhat — a good one makes the slowdown small enough that you won’t notice it during streaming or browsing.

Do You Actually Need a VPN?

Not everyone does. If you only browse the web at home and never remotely access your network, a VPN may not be essential. However, a VPN is strongly worth considering if you:

• Access security cameras while traveling
• Connect to public Wi-Fi regularly
• Use a NAS or home server
• Work remotely
• Want additional privacy from advertisers or your internet provider
• Frequently log into banking or other sensitive accounts away from home

For homeowners building a connected home, a VPN is one of the simplest upgrades you can make to improve both security and privacy. If your goal is simply streaming movies at home, a VPN may be optional. If your goal is protecting a connected home, remotely accessing security cameras, or securing personal data on public Wi-Fi, it’s one of the best investments you can make.

Which VPN Does It Best

GuardSourceHQ evaluated the leading VPN services with a focus on the features that matter most to homeowners, including security, speed, privacy, and remote access. For most people building a secure connected home, one service clearly stands out.

NordVPN — GuardSourceHQ Recommended

NordVPN is GuardSourceHQ’s recommended choice for most homeowners, and it earns that recommendation on more than one front. Its standout strength is Threat Protection Pro, which is genuinely a cut above the competition — it received AV-Comparatives’ approval for effective anti-phishing protection, and it works in three layers: real-time blocking of trackers, ads, and malware while you browse; file scanning that checks downloads for malicious software; and vulnerability detection that flags outdated or dangerous apps on your system. That’s closer to a full security suite than a simple ad blocker, and notably, much of it works even when the VPN tunnel is off.

Beyond that, NordVPN posts the fastest speeds in independent testing thanks to its NordLynx protocol, making it the smoothest option for streaming, remote camera access, and everyday use. It runs RAM-only servers (nothing is written to disk, so nothing survives a reboot), holds an audited no-logs policy verified multiple times, and is based in Panama, outside restrictive data-retention jurisdictions. It also layers in extras like Double VPN for routing through two servers, and a dedicated IP option.

One more thing that makes NordVPN a smart pick for a connected home: a single subscription unlocks the wider Nord Security ecosystem, including a password manager and identity-theft protection. If you’re serious about locking down both your home and your data, that’s real added value under one account.

Surfshark — Best Value for Large Households

Surfshark is an excellent value-focused VPN and the strongest alternative to NordVPN. It’s owned by the same parent company as NordVPN, follows the same independently audited no-logs standards, and offers unlimited simultaneous device connections — making it especially attractive for families with lots of connected devices.

During our testing and day-to-day use, NordVPN consistently delivered faster performance, particularly when remotely accessing home devices, which is why it’s our primary recommendation. However, if unlimited device connections are your priority, Surfshark remains an excellent choice.

Surfshark’s CleanWeb handles ad, tracker, and malware blocking, and it’s included on every plan (unlike some competitors that gate their best protection behind higher tiers). It also offers Alternative ID, which generates an alias identity and email to keep your real details off signup forms — handy if email masking is something you want. Its threat protection isn’t quite as deep as NordVPN’s Threat Protection Pro, and its server fleet is smaller, but for the price it’s hard to beat.

Our Recommendation

If you’re looking for a VPN to protect your home network, remotely access your security cameras, or secure a NAS, NordVPN is the service we recommend for most GuardSourceHQ readers. It’s the fastest in independent testing, has the most capable security features, and backs it with a long, audited track record — all through an easy-to-use interface that doesn’t become overly complicated.

Choose Surfshark instead if you want to cover an unlimited number of devices, you want alias-email features built in, or you simply want strong protection at the lowest price. Either way you’re protected by the same audited standards, so it really comes down to whether you want NordVPN’s top-tier features or Surfshark’s value and device count.

A VPN isn’t a replacement for strong passwords, two-factor authentication, or keeping your devices updated. Think of it as one important layer in a complete home security strategy. Combined with properly configured security cameras, a secure network, and good cybersecurity habits, it helps protect both your home and your personal information.

Disclosure

Products are recommended based on real-world performance, long-term reliability, and whether we’d confidently use them in our own homes.